Ok so you kind of ignored the search I did, so I'd like to remind you that the point of arguing is to get to a point of agreement, not just yell at each other for eternity. This is probably the last thing I'm adding here just because of that.
Basically, any arbitrary line is 1 dimensional, if you don't agree with that, then I'm officially taking away your talking-about-dimensions licence. Whether it's horizontal, vertical, I even checked diagonal, all of them are 1D, just as long as it's straight. With that being said, allow me to kno tackle all your arguments 1 by 1.
"If it's rotating 90 degrees from the x-axis to the y-axis, then it is moving along a 2-dimentional plane." When I said "x-axis rotated 90 degrees", I meant visually, to us, like how if you were to rotate the camera 90 degrees in a 2d game, what looks vertical to you is actually the x-axis.
"By definition, 1d IS the x-axis." According to Wiktionary (basically Wikipedia but it's a dictionary), the definition of 1D is "Having length, but no width, height or depth. A straight line is one-dimensional.", nothing about the x-axis, you can even check x-axis and length, and see that the x-axis has nothing to do with the first dimension.
"When you're walking in the 3rd dimension, you always walk along the x, y and z axes. Never does the w-axis replace another axis." That is a slightly unfortunate example, the game 4D golf actually lets you hide the y-axis in favour of just seeing the x, z and w axes, in other words, the w-axis replaces the y-axis. I even looked it up and, if you REALLY wanted to, you could have d, p, and n axes (don't bother finding deeper meaning in that, I just picked 3 random letters).
"Also, when you switch gravity in a game, you're still going along the specific axes. Switching gravity in a 2d plane, for example, only flips the x and y axes because those are the only axes you could walk only axes you could walk on." Ok so you kind of took so long to respond that I forgot what I meant by the whole gravity switching thing. Basically what I think I meant by it is that some 2D games have gravity, and some don't, so there should be nothing stopping that from applying to 1D, and also that gravity can be on the x-axis.
"In 1D, the controls would just be flipped because you could only go left and right." Do you mean gravity? I seriously can't think of a situation where controls would flip in ANY game.
Also, play The Boundary Condition (https://thesquaregroot.itch.io/the-boundary-condition) and tell me if your opinion on dimensions change.


